Abstract
The properties of several different investments were investigated including phosphate bonded, magnesia bonded, and alumina cement investments.
Measurements included the setting expansion, thermal expansion, and compressive strength of investments, as well as the tensile strength, elongation, Vickers hardness (VHN) and surface roughness of titanium castings. For phosphate bonded investment, the setting expansion after being mixed with its own mixing solution was 2.10%, which was larger than the other investments; the thermal expansion was −0.25% at 200 ^∘C, the compressive strength 14 and 5 MPa after heating. For titanium cast in phosphate bonded investment, the hardness on its top surface was 655 Hv, the tensile strength was 379 MPa, the elongation was 19.4%, and the surface roughness was 2.29 μ m. Athough the thermal expansion of phosphate bonded investment is small, the setting expansion is large enough to compensate for the shrinkage of titanium castings. As its thermal expansion at T ≥ 600∘C was constant and its heating-cooling cycle was almost reversible, these two properties can reduce the thermal shock and thus avoid cracking of the investment.
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H. HAMANAKA, Titanium Casting—A Review of Casting Machines, Transactions of 2nd International Congress on Dental Materials (1993) p. 89.
Y. ODA, Y. KUDOH, E. KAWADA, M. YOSHINARI and K. HASEGAWA, Bull. of Tokyo Dent. Coll. 37 (1996) 29.
O. MIYAKAWA, K. WATANABE and S. OKAWA, J. Dent. Mater. 8 (1989) 175.
T. TOGAYA, M. SUZUKI, K. IDA, M. NAKAMURA, T. UEMURA and S. OKUDA, ibid. 4 (1985) 344.
T. MIYAZAKI, Y. TANI, Y. TAMAKI, E. SUZUKI and T. MIYAJI, ibid. 6 (1987) 633.
F. WATARI, F. NISHIMURA, R. FUKUMOTO, N. MORITA and S. NOMOTO, ibid. 6 (1987) 551.
T. MIYAZAKI, Recent Advance in Investment Materials for Titanium Castings, Transaction of 2nd International Congress on Dental Materials (1993) p. 107.
S. OKAWA, J. Dent. Eng. 111 (1994) 21.
T. TOGAYA, M. SUZUKI, K. IDA, M. NAKAMURA, T. UEMURA and S. OKUDA, J. Dent. Mater. 4 (1985) 344.
S. OKAWA, ibid. 13 (1994) 253.
S. TSURUTA, K. KOYAMA, M. KITO, M. KIM, J. HASEGAWA and G. AICHI, J. Dent. Sci. 29 (1991) 481.
Y. ODA, B. SHEN and T. SUMII, “A Study on the Fit of Titanium Castings-Comparison of Titanium Casting Systems-,” Shikwa Gakuho 94 (1994) 641.
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Hsu, H.C., Kikuchi, H., Yen, S.K. et al. Evaluation of different bonded investments for dental titanium casting. J Mater Sci: Mater Med 16, 821–825 (2005). https://doi.org/10.1007/s10856-005-3585-2
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DOI: https://doi.org/10.1007/s10856-005-3585-2